public void CanRerenderFiles() { var mockDebugStatusReader = new StubDebugStatusReader(false); var mockFileWriterFactory = new StubFileWriterFactory(); var mockFileReaderFactory = new StubFileReaderFactory(); mockFileReaderFactory.SetContents(css); mockFileReaderFactory.SetFileExists(false); ICssBundle cssBundle = new CssBundle(mockDebugStatusReader, mockFileWriterFactory, mockFileReaderFactory); cssBundle.ClearCache(); cssBundle .Add("/css/first.css") .Render("~/css/can_rerender_files.css"); Assert.AreEqual("li{margin-bottom:.1em;margin-left:0;margin-top:.1em}th{font-weight:normal;vertical-align:bottom}.FloatRight{float:right}.FloatLeft{float:left}", mockFileWriterFactory.Files[@"C:\css\can_rerender_files.css"]); mockFileReaderFactory.SetContents(css2); mockFileReaderFactory.SetFileExists(true); mockFileWriterFactory.Files.Clear(); cssBundle.ClearCache(); ICssBundle cssBundle2 = new CssBundle(mockDebugStatusReader, mockFileWriterFactory, mockFileReaderFactory); cssBundle2 .Add("/css/first.css") .Render("~/css/can_rerender_files.css"); Assert.AreEqual("li{margin-bottom:.1em;margin-left:0;margin-top:.1em}th{font-weight:normal;vertical-align:bottom}", mockFileWriterFactory.Files[@"C:\css\can_rerender_files.css"]); }